I realised I undervolted my cpu too much. If you are undervolting don't go to the edge of stability. Go just above the stability at which the cpu can run well on load.
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I had a similar issue with it a while back. Mine undervolts until -125mV - -130mV and is still stable during regular use, but in some rare cases the system would completely crash after playing a more intensive game. Dialing it back to -110mV solved it for me, and it's what I'm still using to this day on my 7700HQ.
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my ryzen 5 1600 undervolts to -0.150V from base voltage. although it crashed after long inactivity. -0.134 is now perfect
It’s not at all surprising that restricting power to a piece of electronic circuitry might make it unstable.
What is surprising is that people do this and then continue to blame a Linux distro for their self-inflicted problems.
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I do apologise if I ever blamed the distro when it was not called for. 
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Anyway a heads up for future tinkers who aren't experienced with undervolting but do it anyway.
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Also turn off amd cool and quiet. The powerstates are said to cause system freeze after afk.
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